I've made numerous deposits into my 1win account, and when it comes to deposits, the money is transferred instantly. However, when it comes to withdrawals, it takes them 2-3 days.
The chances of you hitting a big winning streak, tempting though that is, are very, very low. Casinos will want to keep you in there after you win so that they have a chance to win their money back. Experts suggest cashing out and walking away after you've won.